<template>
  <view class="search-view">
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none" placeholder="请输入搜索内容" clearButton="always"></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0 ">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="good-name">{{item.goods_name}}</view>
          <uni-icons type="arrowright" size="16"></uni-icons>
        
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:' ',
        //搜索的结果列表
        searchResults:[],
        //搜索历史的数组
        historyList:[]
      };
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      //input输入事件的处理函数
      input(e) {
        // console.log(e)
        clearTimeout(this.timer)
        
        this.timer =  setTimeout(() => {
          // console.log(e)
          this.kw = e
          this.getSearchList()
        },500)
      },
      async getSearchList(){
        //判断关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return
        }
        
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query : this.kw })
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        
        this.saveSearchHistory()
      },
      gotoDetail(item) {
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory(){
       // this.historyList.push(this.kw)
         // 1. 将 Array 数组转化为 Set 对象
         const set = new Set(this.historyList)
         // 2. 调用 Set 对象的 delete 方法，移除对应的元素
         set.delete(this.kw)
         // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
         set.add(this.kw)
         // 4. 将 Set 对象转化为 Array 数组
         this.historyList = Array.from(set)
         // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
           uni.setStorageSync('kw', JSON.stringify(this.historyList))
           },
           clean(){
             this.historyList = []
             uni.setStorageSync('kw', '[]')
           },
           gotoGoodsList(kw){
             uni.navigateTo({
               url:'/subpkg/goods_list/goods_list?query=' + kw
             })
           }
      },
    
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
// .search-view{
//     background-color: #FFFFFF;
//   }
  .search-box{
    position: sticky;
    top:0;
    z-index: 999;
  }
  
  .sugg-list{
    padding: 0 5px;
    background-color: #FFFFFF;
    .sugg-item{
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      .good-name{
         // 文字不允许换行（单行文本）
              white-space: nowrap;
              // 溢出部分隐藏
              overflow: hidden;
              // 文本溢出后，使用 ... 代替
              text-overflow: ellipsis;
              margin-right: 3px;
      }
    }
  }
  
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    
    .history-list{
      .uni-tag{
        display: inline-block;
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
